Facade and window perimeter sealing in Addington, Kent
Facade joint and window perimeter sealing on commercial buildings in Addington. CHAS accredited and fully insured, with a 12-month guarantee.
- Weathered facade joints that have lost their grip
- Draughts around frames and panels
- Unsightly perimeter sealant on a visible elevation
Facade sealing near Addington
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Facade sealing in Addington, done properly
We are often asked to look at water coming in around frames. Very often the perimeter bead has cracked or lost its grip, but not always. If the evidence points away from the sealant, we say so before quoting. Most enquiries involve discoloured or dirty facade joints and new sealant peeling off old mastic, on shopfront frames, window and door perimeters and stone and brick facade joints. Looking for mastic applicators who cover Addington? Mastic Doctor has worked for contractors, FMs and building owners since 2005, with CSCS-carded applicators.
Conversions of older rural buildings near smaller places such as Addington bring stone, flint, brick and timber up against new glazing. Those joints need a sealant that suits an uneven, sometimes porous surface, and often a colour chosen for the building.
Every job is signed off with a 12-month guarantee. It’s a plain promise: if our work fails within that year, we put it right.
- Location
- Addington (ME19)
- Wider area
- Kent
- Cover
- A 12-month guarantee
- Quote
- A fixed quote before we start
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Work for main contractors and building owners
Hotels, schools, healthcare sites, offices and retail units book us directly too. The work is planned around how the building runs, so the building keeps working while we do.
Building owners and managing agents use us on everything from one building to a spread of sites. Several sites can go on one quote, so there’s one set of paperwork to deal with.
What happens if it’s left?
The longer a failed joint is left, the more the substrate suffers: wet edges break down, so repairs may be needed before resealing. Acting at the first sign of splitting keeps the fix simple. One visit to deal with every failing joint makes more sense than several trips to a place like Addington, rather than one at a time. Photos of every joint help us quote for the whole job.
A quote for facade joints depends on quantities, condition and access, plus any specification you are working to. Ask us for a fixed quote.
Why choose Mastic Doctor in Addington
- Joints cleaned back to sound surfaces
- 12-month guarantee on workmanship
- Health and safety: CHAS accredited
- One number for every site we cover
See our cost guide or our accreditations.
Our process
Site rules come first: signing in, inductions and any permit to work. With the paperwork done, the joints are worked through in the order agreed with your site contact, and each area is checked before we leave it. Rural sites near Addington may need directions, gate codes or a contact on site. Send that with the details and we’ll confirm the plan with the quote.
- First we review photographs, drawings or what we saw on a visit, and agree how each joint will be reached.
- Failed sealant is cut out along its full length.
- Joint faces are cleaned to firm, sound material, with primer where the sealant maker specifies it.
- Backing rod, or bond-breaker tape in shallow joints, limits the depth.
- A facade-grade sealant rated for the movement goes in, tooled to a concave profile.
- We walk the finished joints with you before handing over.
Preparing the site
- Explain the parking and delivery arrangements
- Send your site hours and access windows
- Share the asbestos register for older buildings
Get a fixed quote
Quotes are fixed against the scope you send, so you know the figure before anyone is on site. To start the process, speak to us on 01277 525 020 or send photos by email.
Related advice
Site staff or a sealant specialist?
Using site staff can make sense for a small touch-up, but larger jobs are different: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.
Redoing a failed joint normally costs more than getting it right at the outset, since all of it has to come out and the faces be cleaned back again. That’s why many clients bring in a specialist from the beginning.
What we can’t put right
Before quoting, we check that sealant is the right answer. It isn’t the answer for:
- Water getting in through cracked render or porous masonry
- Joints too narrow for the movement they take, which need redesign
- Work on the window or framing system itself
If in doubt, give us a call on 01277 525 020 or email drawings and photos and we’ll say what we think before you book.
What we seal
- Stone and brick facade joints
- Coping and flashing joints
- Perimeter joints where frames meet the structure
- Cladding panel joints
- Window and door perimeters
- Shopfront frames
Keeping the joints sound
After handover, a little attention goes a long way:
- Don’t wait for a second leak before calling
- Ask about asbestos in pre-2000 mastic
- Avoid patch repairs on failed facade joints
- Note when each elevation was last resealed
After heavy weather, check vulnerable elevations for signs of water inside. An early report usually means a small reseal rather than a bigger repair.
In pre-2000 buildings, check the asbestos register before old sealant is cut out. Older sealants can contain asbestos.
Addington: questions and answers
Is Kings Hill Business Park, near Addington, within your area?
Yes, sites like Kings Hill Business Park are within our area, along with the rest of Addington. A few photographs and the unit address let us price the work.
Can you take on a job at a hospital such as Maidstone Hospital?
Yes, healthcare and care buildings are part of our work. Each area is agreed with the ward or department and the estates team in advance.
Will your applicators have CSCS cards?
Yes. We use CSCS-carded applicators.
Do you hold CHAS accreditation?
Yes. Mastic Doctor is CHAS accredited and a Constructionline member, which helps with supplier vetting.
Can you find out why a window is leaking?
Yes. Photos are often enough to start, followed by a visit if needed. Failed perimeter sealant is a common cause, but not the only one, and we will tell you which.
How do you choose the sealant?
Where there’s a specification, we use the product it names. If not, we choose for the movement, the surfaces and the conditions, in line with the manufacturer’s guidance.
When is resealing likely to be due?
There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Sealant joints are maintenance items, so inspect them regularly.
Sites and facades in and around Addington
Addington is in the South East, one of the UK’s drier regions. Even so, frost and condensation on steel and glass are common on winter mornings, so external mastic is timed for workable conditions and agreed with the site manager. Addington is about 25 miles from central London. Commuter-belt towns tend to see a steady flow of new flats, offices and commercial schemes, and each scheme needs its mastic sealed to programme.
New wings at hospitals like Maidstone Hospital, 4.9 miles to the south-east of Addington, bring long runs of window and panel joints to seal. Work at a hotel such as Bear Hotel (to the south-east of Addington) tends to be programmed around bookings, mastic included. School extensions, at buildings such as Offham Primary School, normally run to the summer holidays, mastic included.
Addington is about 7 miles north-west of Maidstone, in Kent. Across the ME19 postcode area, the process is the same: details in, fixed quote out, then sealing and a 12-month guarantee. We work across 931 places in Kent, from busy centres to rural villages. There’s a separate page for London, roughly 25 miles from Addington.
If you need facade sealing in ME19, the process matches everywhere else we work: send details, get a quote, we seal, guaranteed. Streets here include London Road, The Links and Trottiscliffe Road, and sites on any of them can send details for a fixed quote. If your building is just outside Addington, we cover Ryarsh (1 mile north-east), Trottiscliffe (1 mile north-west), Vigo Village (2 miles north-west), Culverstone Green (3 miles north-west) and Harvel (3 miles north). Bigger towns within reach include Maidstone (7 miles south-east), Sittingbourne (15 miles east), Dartford (12 miles north-west), Sevenoaks (9 miles west), Royal Tunbridge Wells (13 miles south-west) and Gravesend (9 miles north).
Landmarks near Addington
We work on buildings around The Angel Inn, The Malling School and Manor Park Country Park. The closest station to Addington is West Malling station, about 1.8 miles south-east. Nearby you’ll also find Coldrum Long Barrow (1.2 miles north) and Leybourne Castle (1.7 miles east).